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<h2><span class="refentrytitle"><a name="libgwyprocess-elliptic.top_of_page"></a>elliptic</span></h2>
<p>elliptic — Functions to work with elliptic areas</p>
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<div class="refsynopsisdiv">
<a name="libgwyprocess-elliptic.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis">
#include <libprocess/gwyprocess.h>
<a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gint"><span class="returnvalue">gint</span></a> <a class="link" href="libgwyprocess-elliptic.html#gwy-data-field-elliptic-area-fill" title="gwy_data_field_elliptic_area_fill ()">gwy_data_field_elliptic_area_fill</a> (<em class="parameter"><code><a class="link" href="GwyDataField.html" title="GwyDataField"><span class="type">GwyDataField</span></a> *data_field</code></em>,
<em class="parameter"><code><a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> col</code></em>,
<em class="parameter"><code><a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> row</code></em>,
<em class="parameter"><code><a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> width</code></em>,
<em class="parameter"><code><a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> height</code></em>,
<em class="parameter"><code><a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> value</code></em>);
<a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gint"><span class="returnvalue">gint</span></a> <a class="link" href="libgwyprocess-elliptic.html#gwy-data-field-elliptic-area-extract" title="gwy_data_field_elliptic_area_extract ()">gwy_data_field_elliptic_area_extract</a>
(<em class="parameter"><code><a class="link" href="GwyDataField.html" title="GwyDataField"><span class="type">GwyDataField</span></a> *data_field</code></em>,
<em class="parameter"><code><a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> col</code></em>,
<em class="parameter"><code><a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> row</code></em>,
<em class="parameter"><code><a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> width</code></em>,
<em class="parameter"><code><a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> height</code></em>,
<em class="parameter"><code><a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> *data</code></em>);
<span class="returnvalue">void</span> <a class="link" href="libgwyprocess-elliptic.html#gwy-data-field-elliptic-area-unextract" title="gwy_data_field_elliptic_area_unextract ()">gwy_data_field_elliptic_area_unextract</a>
(<em class="parameter"><code><a class="link" href="GwyDataField.html" title="GwyDataField"><span class="type">GwyDataField</span></a> *data_field</code></em>,
<em class="parameter"><code><a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> col</code></em>,
<em class="parameter"><code><a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> row</code></em>,
<em class="parameter"><code><a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> width</code></em>,
<em class="parameter"><code><a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> height</code></em>,
<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> *data</code></em>);
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="returnvalue">gint</span></a> <a class="link" href="libgwyprocess-elliptic.html#gwy-data-field-get-elliptic-area-size" title="gwy_data_field_get_elliptic_area_size ()">gwy_data_field_get_elliptic_area_size</a>
(<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> width</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> height</code></em>);
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="returnvalue">gint</span></a> <a class="link" href="libgwyprocess-elliptic.html#gwy-data-field-circular-area-fill" title="gwy_data_field_circular_area_fill ()">gwy_data_field_circular_area_fill</a> (<em class="parameter"><code><a class="link" href="GwyDataField.html" title="GwyDataField"><span class="type">GwyDataField</span></a> *data_field</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> col</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> row</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> radius</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> value</code></em>);
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="returnvalue">gint</span></a> <a class="link" href="libgwyprocess-elliptic.html#gwy-data-field-circular-area-extract" title="gwy_data_field_circular_area_extract ()">gwy_data_field_circular_area_extract</a>
(<em class="parameter"><code><a class="link" href="GwyDataField.html" title="GwyDataField"><span class="type">GwyDataField</span></a> *data_field</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> col</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> row</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> radius</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> *data</code></em>);
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="returnvalue">gint</span></a> <a class="link" href="libgwyprocess-elliptic.html#gwy-data-field-circular-area-extract-with-pos" title="gwy_data_field_circular_area_extract_with_pos ()">gwy_data_field_circular_area_extract_with_pos</a>
(<em class="parameter"><code><a class="link" href="GwyDataField.html" title="GwyDataField"><span class="type">GwyDataField</span></a> *data_field</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> col</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> row</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> radius</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> *data</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> *xpos</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> *ypos</code></em>);
<span class="returnvalue">void</span> <a class="link" href="libgwyprocess-elliptic.html#gwy-data-field-circular-area-unextract" title="gwy_data_field_circular_area_unextract ()">gwy_data_field_circular_area_unextract</a>
(<em class="parameter"><code><a class="link" href="GwyDataField.html" title="GwyDataField"><span class="type">GwyDataField</span></a> *data_field</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> col</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> row</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> radius</code></em>,
<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> *data</code></em>);
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="returnvalue">gint</span></a> <a class="link" href="libgwyprocess-elliptic.html#gwy-data-field-get-circular-area-size" title="gwy_data_field_get_circular_area_size ()">gwy_data_field_get_circular_area_size</a>
(<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> radius</code></em>);
</pre>
</div>
<div class="refsect1">
<a name="libgwyprocess-elliptic.description"></a><h2>Description</h2>
<p>
Method for extraction and putting back data from/to elliptic and circular
areas can be used to implement sample-wise operations, that is operations
that depend only on sample value not on its position, on these areas:
</p>
<p>
</p>
<div class="informalexample">
<table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
<tbody>
<tr>
<td class="listing_lines" align="right"><pre>1
2
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5
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7
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9
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11
12
13</pre></td>
<td class="listing_code"><pre class="programlisting"><span class="usertype">gdouble</span><span class="normal"> </span><span class="symbol">*</span><span class="normal">data</span><span class="symbol">;</span>
<span class="usertype">gint</span><span class="normal"> n</span><span class="symbol">,</span><span class="normal"> i</span><span class="symbol">;</span>
<span class="normal">data </span><span class="symbol">=</span><span class="normal"> </span><span class="function"><a href="/usr/share/gtk-doc/html/glib/glib-Memory-Allocation.html#g-new">g_new</a></span><span class="symbol">(</span><span class="normal"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble">gdouble</a></span><span class="symbol">,</span><span class="normal"> width</span><span class="symbol">*</span><span class="normal">height</span><span class="symbol">);</span>
<span class="normal">n </span><span class="symbol">=</span><span class="normal"> </span><span class="function"><a href="#gwy-data-field-elliptic-area-extract">gwy_data_field_elliptic_area_extract</a></span><span class="symbol">(</span><span class="normal">data_field</span><span class="symbol">,</span>
<span class="normal"> col</span><span class="symbol">,</span><span class="normal"> row</span><span class="symbol">,</span><span class="normal"> width</span><span class="symbol">,</span><span class="normal"> height</span><span class="symbol">,</span>
<span class="normal"> data</span><span class="symbol">);</span>
<span class="keyword">for</span><span class="normal"> </span><span class="symbol">(</span><span class="normal">i </span><span class="symbol">=</span><span class="normal"> </span><span class="number">0</span><span class="symbol">;</span><span class="normal"> i </span><span class="symbol"><</span><span class="normal"> n</span><span class="symbol">;</span><span class="normal"> i</span><span class="symbol">++)</span><span class="normal"> </span><span class="cbracket">{</span>
<span class="normal"> </span><span class="symbol">...</span><span class="normal"> </span><span class="keyword">do</span><span class="normal"> something </span><span class="usertype">with</span><span class="normal"> data</span><span class="symbol">[</span><span class="normal">i</span><span class="symbol">]</span><span class="normal"> </span><span class="symbol">...</span>
<span class="cbracket">}</span>
<span class="function"><a href="#gwy-data-field-elliptic-area-unextract">gwy_data_field_elliptic_area_unextract</a></span><span class="symbol">(</span><span class="normal">data_field</span><span class="symbol">,</span>
<span class="normal"> col</span><span class="symbol">,</span><span class="normal"> row</span><span class="symbol">,</span><span class="normal"> width</span><span class="symbol">,</span><span class="normal"> height</span><span class="symbol">,</span>
<span class="normal"> data</span><span class="symbol">);</span></pre></td>
</tr>
</tbody>
</table>
</div>
<p>
</p>
<p>
Another possibility is to use <a class="link" href="GwyDataLine.html" title="GwyDataLine"><span class="type">GwyDataLine</span></a> methods on the extracted data
(in practice one would use the same data line repeatedly, of course):
</p>
<p>
</p>
<div class="informalexample">
<table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
<tbody>
<tr>
<td class="listing_lines" align="right"><pre>1
2
3
4
5
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7
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9
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15</pre></td>
<td class="listing_code"><pre class="programlisting"><span class="usertype">GwyDataLine</span><span class="normal"> </span><span class="symbol">*</span><span class="normal">data_line</span><span class="symbol">;</span>
<span class="usertype">gdouble</span><span class="normal"> </span><span class="symbol">*</span><span class="normal">data</span><span class="symbol">;</span>
<span class="usertype">gint</span><span class="normal"> n</span><span class="symbol">;</span>
<span class="normal">n </span><span class="symbol">=</span><span class="normal"> </span><span class="function"><a href="#gwy-data-field-get-elliptic-area-size">gwy_data_field_get_elliptic_area_size</a></span><span class="symbol">(</span><span class="normal">data_field</span><span class="symbol">,</span><span class="normal"> width</span><span class="symbol">,</span><span class="normal"> height</span><span class="symbol">);</span>
<span class="normal">data_line </span><span class="symbol">=</span><span class="normal"> </span><span class="function"><a href="GwyDataLine.html#gwy-data-line-new">gwy_data_line_new</a></span><span class="symbol">(</span><span class="normal">n</span><span class="symbol">,</span><span class="normal"> </span><span class="number">1.0</span><span class="symbol">,</span><span class="normal"> <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#FALSE:CAPS">FALSE</a></span><span class="symbol">);</span>
<span class="normal">data </span><span class="symbol">=</span><span class="normal"> </span><span class="function"><a href="GwyDataLine.html#gwy-data-line-get-data">gwy_data_line_get_data</a></span><span class="symbol">(</span><span class="normal">data_line</span><span class="symbol">);</span>
<span class="function"><a href="#gwy-data-field-elliptic-area-extract">gwy_data_field_elliptic_area_extract</a></span><span class="symbol">(</span><span class="normal">data_field</span><span class="symbol">,</span>
<span class="normal"> col</span><span class="symbol">,</span><span class="normal"> row</span><span class="symbol">,</span><span class="normal"> width</span><span class="symbol">,</span><span class="normal"> height</span><span class="symbol">,</span>
<span class="normal"> data</span><span class="symbol">);</span>
<span class="function">gwy_data_line_pixelwise_filter</span><span class="symbol">(</span><span class="normal">data_line</span><span class="symbol">,</span><span class="normal"> </span><span class="symbol">...);</span>
<span class="function"><a href="#gwy-data-field-elliptic-area-unextract">gwy_data_field_elliptic_area_unextract</a></span><span class="symbol">(</span><span class="normal">data_field</span><span class="symbol">,</span>
<span class="normal"> col</span><span class="symbol">,</span><span class="normal"> row</span><span class="symbol">,</span><span class="normal"> width</span><span class="symbol">,</span><span class="normal"> height</span><span class="symbol">,</span>
<span class="normal"> data</span><span class="symbol">);</span>
<span class="function"><a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#g-object-unref">g_object_unref</a></span><span class="symbol">(</span><span class="normal">data_line</span><span class="symbol">);</span></pre></td>
</tr>
</tbody>
</table>
</div>
<p>
</p>
</div>
<div class="refsect1">
<a name="libgwyprocess-elliptic.details"></a><h2>Details</h2>
<div class="refsect2">
<a name="gwy-data-field-elliptic-area-fill"></a><h3>gwy_data_field_elliptic_area_fill ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="returnvalue">gint</span></a> gwy_data_field_elliptic_area_fill (<em class="parameter"><code><a class="link" href="GwyDataField.html" title="GwyDataField"><span class="type">GwyDataField</span></a> *data_field</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> col</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> row</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> width</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> height</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> value</code></em>);</pre>
<p>
Fills an elliptic region of a data field with given value.
</p>
<p>
The elliptic region is defined by its bounding box which must be completely
contained in the data field.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>data_field</code></em> :</span></p></td>
<td>A data field.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>col</code></em> :</span></p></td>
<td>Upper-left bounding box column coordinate.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>row</code></em> :</span></p></td>
<td>Upper-left bounding box row coordinate.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>width</code></em> :</span></p></td>
<td>Bounding box width (number of columns).</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>height</code></em> :</span></p></td>
<td>Bounding box height (number of rows).</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>value</code></em> :</span></p></td>
<td>Value to be entered.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The number of filled values.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gwy-data-field-elliptic-area-extract"></a><h3>gwy_data_field_elliptic_area_extract ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="returnvalue">gint</span></a> gwy_data_field_elliptic_area_extract
(<em class="parameter"><code><a class="link" href="GwyDataField.html" title="GwyDataField"><span class="type">GwyDataField</span></a> *data_field</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> col</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> row</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> width</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> height</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> *data</code></em>);</pre>
<p>
Extracts values from an elliptic region of a data field.
</p>
<p>
The elliptic region is defined by its bounding box which must be completely
contained in the data field.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>data_field</code></em> :</span></p></td>
<td>A data field.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>col</code></em> :</span></p></td>
<td>Upper-left bounding box column coordinate.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>row</code></em> :</span></p></td>
<td>Upper-left bounding box row coordinate.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>width</code></em> :</span></p></td>
<td>Bounding box width (number of columns).</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>height</code></em> :</span></p></td>
<td>Bounding box height (number of rows).</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>data</code></em> :</span></p></td>
<td>Location to store the extracted values to. Its size has to be
sufficient to contain all the extracted values. As a conservative
estimate <em class="parameter"><code>width</code></em>*<em class="parameter"><code>height</code></em> can be used, or the
size can be calculated with <a class="link" href="libgwyprocess-elliptic.html#gwy-data-field-get-elliptic-area-size" title="gwy_data_field_get_elliptic_area_size ()"><code class="function">gwy_data_field_get_elliptic_area_size()</code></a>.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The number of extracted values.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gwy-data-field-elliptic-area-unextract"></a><h3>gwy_data_field_elliptic_area_unextract ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gwy_data_field_elliptic_area_unextract
(<em class="parameter"><code><a class="link" href="GwyDataField.html" title="GwyDataField"><span class="type">GwyDataField</span></a> *data_field</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> col</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> row</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> width</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> height</code></em>,
<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> *data</code></em>);</pre>
<p>
Puts values back to an elliptic region of a data field.
</p>
<p>
The elliptic region is defined by its bounding box which must be completely
contained in the data field.
</p>
<p>
This method does the reverse of <a class="link" href="libgwyprocess-elliptic.html#gwy-data-field-elliptic-area-extract" title="gwy_data_field_elliptic_area_extract ()"><code class="function">gwy_data_field_elliptic_area_extract()</code></a>
allowing to implement pixel-wise filters on elliptic areas. Values from
<em class="parameter"><code>data</code></em> are put back to the same positions
<a class="link" href="libgwyprocess-elliptic.html#gwy-data-field-elliptic-area-extract" title="gwy_data_field_elliptic_area_extract ()"><code class="function">gwy_data_field_elliptic_area_extract()</code></a> took them from.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>data_field</code></em> :</span></p></td>
<td>A data field.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>col</code></em> :</span></p></td>
<td>Upper-left bounding box column coordinate.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>row</code></em> :</span></p></td>
<td>Upper-left bounding box row coordinate.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>width</code></em> :</span></p></td>
<td>Bounding box width (number of columns).</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>height</code></em> :</span></p></td>
<td>Bounding box height (number of rows).</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>data</code></em> :</span></p></td>
<td>The values to put back. It must be the same array as in previous
<a class="link" href="libgwyprocess-elliptic.html#gwy-data-field-elliptic-area-extract" title="gwy_data_field_elliptic_area_extract ()"><code class="function">gwy_data_field_elliptic_area_extract()</code></a>.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gwy-data-field-get-elliptic-area-size"></a><h3>gwy_data_field_get_elliptic_area_size ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="returnvalue">gint</span></a> gwy_data_field_get_elliptic_area_size
(<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> width</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> height</code></em>);</pre>
<p>
Calculates an upper bound of the number of samples in an elliptic region.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>width</code></em> :</span></p></td>
<td>Bounding box width.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>height</code></em> :</span></p></td>
<td>Bounding box height.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The number of pixels in an elliptic region with given rectangular
bounds (or its upper bound).</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gwy-data-field-circular-area-fill"></a><h3>gwy_data_field_circular_area_fill ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="returnvalue">gint</span></a> gwy_data_field_circular_area_fill (<em class="parameter"><code><a class="link" href="GwyDataField.html" title="GwyDataField"><span class="type">GwyDataField</span></a> *data_field</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> col</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> row</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> radius</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> value</code></em>);</pre>
<p>
Fills an elliptic region of a data field with given value.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>data_field</code></em> :</span></p></td>
<td>A data field.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>col</code></em> :</span></p></td>
<td>Row index of circular area centre.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>row</code></em> :</span></p></td>
<td>Column index of circular area centre.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>radius</code></em> :</span></p></td>
<td>Circular area radius (in pixels). Any value is allowed, although
to get areas that do not deviate from true circles after
pixelization too much, half-integer values are recommended,
integer values are NOT recommended.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>value</code></em> :</span></p></td>
<td>Value to be entered.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The number of filled values.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gwy-data-field-circular-area-extract"></a><h3>gwy_data_field_circular_area_extract ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="returnvalue">gint</span></a> gwy_data_field_circular_area_extract
(<em class="parameter"><code><a class="link" href="GwyDataField.html" title="GwyDataField"><span class="type">GwyDataField</span></a> *data_field</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> col</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> row</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> radius</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> *data</code></em>);</pre>
<p>
Extracts values from a circular region of a data field.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>data_field</code></em> :</span></p></td>
<td>A data field.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>col</code></em> :</span></p></td>
<td>Row index of circular area centre.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>row</code></em> :</span></p></td>
<td>Column index of circular area centre.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>radius</code></em> :</span></p></td>
<td>Circular area radius (in pixels). See
<a class="link" href="libgwyprocess-elliptic.html#gwy-data-field-circular-area-extract-with-pos" title="gwy_data_field_circular_area_extract_with_pos ()"><code class="function">gwy_data_field_circular_area_extract_with_pos()</code></a> for caveats.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>data</code></em> :</span></p></td>
<td>Location to store the extracted values to. See
<a class="link" href="libgwyprocess-elliptic.html#gwy-data-field-circular-area-extract-with-pos" title="gwy_data_field_circular_area_extract_with_pos ()"><code class="function">gwy_data_field_circular_area_extract_with_pos()</code></a>.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The number of extracted values. It can be zero when the inside of
the circle does not intersect with the data field.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gwy-data-field-circular-area-extract-with-pos"></a><h3>gwy_data_field_circular_area_extract_with_pos ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="returnvalue">gint</span></a> gwy_data_field_circular_area_extract_with_pos
(<em class="parameter"><code><a class="link" href="GwyDataField.html" title="GwyDataField"><span class="type">GwyDataField</span></a> *data_field</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> col</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> row</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> radius</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> *data</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> *xpos</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> *ypos</code></em>);</pre>
<p>
Extracts values with positions from a circular region of a data field.
</p>
<p>
The row and column indices stored to <em class="parameter"><code>xpos</code></em> and <em class="parameter"><code>ypos</code></em> are relative to the
area centre, i.e. to (<em class="parameter"><code>col</code></em>, <em class="parameter"><code>row</code></em>). The central pixel will therefore have
0 at the corresponding position in both <em class="parameter"><code>xpos</code></em> and <em class="parameter"><code>ypos</code></em>.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>data_field</code></em> :</span></p></td>
<td>A data field.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>col</code></em> :</span></p></td>
<td>Row index of circular area centre.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>row</code></em> :</span></p></td>
<td>Column index of circular area centre.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>radius</code></em> :</span></p></td>
<td>Circular area radius (in pixels). Any value is allowed, although
to get areas that do not deviate from true circles after
pixelization too much, half-integer values are recommended,
integer radii are NOT recommended.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>data</code></em> :</span></p></td>
<td>Location to store the extracted values to. Its size has to be
sufficient to contain all the extracted values. As a conservative
estimate (2*floor(<em class="parameter"><code>radius</code></em>)+1)^2 can be used, or the size can be
calculated with <a class="link" href="libgwyprocess-elliptic.html#gwy-data-field-get-circular-area-size" title="gwy_data_field_get_circular_area_size ()"><code class="function">gwy_data_field_get_circular_area_size()</code></a>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>xpos</code></em> :</span></p></td>
<td>Location to store relative column indices of values in <em class="parameter"><code>data</code></em> to,
the size requirements are the same as for <em class="parameter"><code>data</code></em>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>ypos</code></em> :</span></p></td>
<td>Location to store relative tow indices of values in <em class="parameter"><code>data</code></em> to,
the size requirements are the same as for <em class="parameter"><code>data</code></em>.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The number of extracted values. It can be zero when the inside of
the circle does not intersect with the data field.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.2</p>
</div>
<hr>
<div class="refsect2">
<a name="gwy-data-field-circular-area-unextract"></a><h3>gwy_data_field_circular_area_unextract ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gwy_data_field_circular_area_unextract
(<em class="parameter"><code><a class="link" href="GwyDataField.html" title="GwyDataField"><span class="type">GwyDataField</span></a> *data_field</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> col</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> row</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> radius</code></em>,
<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> *data</code></em>);</pre>
<p>
Puts values back to a circular region of a data field.
</p>
<p>
This method does the reverse of <a class="link" href="libgwyprocess-elliptic.html#gwy-data-field-circular-area-extract" title="gwy_data_field_circular_area_extract ()"><code class="function">gwy_data_field_circular_area_extract()</code></a>
allowing to implement pixel-wise filters on circular areas. Values from
<em class="parameter"><code>data</code></em> are put back to the same positions
<a class="link" href="libgwyprocess-elliptic.html#gwy-data-field-circular-area-extract" title="gwy_data_field_circular_area_extract ()"><code class="function">gwy_data_field_circular_area_extract()</code></a> took them from.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>data_field</code></em> :</span></p></td>
<td>A data field.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>col</code></em> :</span></p></td>
<td>Row index of circular area centre.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>row</code></em> :</span></p></td>
<td>Column index of circular area centre.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>radius</code></em> :</span></p></td>
<td>Circular area radius (in pixels).</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>data</code></em> :</span></p></td>
<td>The values to put back. It must be the same array as in previous
<a class="link" href="libgwyprocess-elliptic.html#gwy-data-field-circular-area-unextract" title="gwy_data_field_circular_area_unextract ()"><code class="function">gwy_data_field_circular_area_unextract()</code></a>.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gwy-data-field-get-circular-area-size"></a><h3>gwy_data_field_get_circular_area_size ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="returnvalue">gint</span></a> gwy_data_field_get_circular_area_size
(<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> radius</code></em>);</pre>
<p>
Calculates an upper bound of the number of samples in a circular region.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>radius</code></em> :</span></p></td>
<td>Circular area radius (in pixels).</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The number of pixels in a circular region with given rectangular
bounds (or its upper bound).</td>
</tr>
</tbody>
</table></div>
</div>
</div>
</div>
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